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Rapid method for corrosion protection determination of VCI films

S.B. Valdez (Engineering Institute, Autonomus University of Baja California, Mexicali, Mexico)
R.K. Zlatev (Engineering Institute, Autonomus University of Baja California, Mexicali, Mexico)
W.M. Schorr (Engineering Institute, Autonomus University of Baja California, Mexicali, Mexico)
G.N. Rosas (Engineering Institute, Autonomus University of Baja California, Mexicali, Mexico)
Ts. Dobrev (Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria)
M. Monev (Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria)
I. Krastev (Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 1 November 2006

400

Abstract

Purpose

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To develop and test a rapid method for evaluation of the corrosion protection (CP) of carbon steel (CS) by vapour corrosion inhibitors (VCI) films.

Design/methodology/approach

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The determination of the CP by VCI on CSs is commonly carried out in a chamber applying neutral salt spray (NSS) and usually it takes many days. The common disadvantage of the various rapid methods created until now is the need of special laboratory equipment making their application complicated and inconvenient for field tests. The method for CP measurement of VCI films on CS described in this study is based on measurement of the height of the anodic peak under galvanostatic condition applied earlier on other types of films and coatings. By means of a calibration plot: peak height (V) vs NSS protection time (s), CP of VCI films on CS specimens expressed in hours NSS is determined in a few seconds without using an NSS chamber. Measurements of CP by VCI films under field conditions are performed applying a hand held tester.

Findings

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Two groups of CS UNS G10180 steel specimens with increasing thickness of VCI films were studied – one in an NSS chamber and the second by the application of a corrosion tester. The correlation between the results obtained for the two groups of specimens was found and a calibration plot was made.

Practical implications

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Based on this method, a special corrosion tester was developed, able to measure under field conditions as well.

Originality/value

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The method subject of the paper is a further development of a galvanostatic method developed by the authors for CP evaluation of chromate films of Zn and Cd coatings. The method was modified according to the properties of VCI films

Keywords

Citation

Valdez, S.B., Zlatev, R.K., Schorr, W.M., Rosas, G.N., Dobrev, T., Monev, M. and Krastev, I. (2006), "Rapid method for corrosion protection determination of VCI films", Anti-Corrosion Methods and Materials, Vol. 53 No. 6, pp. 362-366. https://doi.org/10.1108/00035590610711705

Publisher

:

Emerald Group Publishing Limited

Copyright © 2006, Emerald Group Publishing Limited

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